Telephone Numbering Plan - Numbering Plan Indicator

The numbering plan indicator (NPI) is a number which is defined in the ITU standard Q.713, paragraph 3.4.2.3.3, indicating the numbering plan of the attached telephone number. NPIs can be found in SCCP and SMS messages. As of 2004, the following numbering plans and their respective numbering plan indicator values have been defined:

NPI Description Standard
0 unknown
1 ISDN Telephony E.164
2 generic
3 data X.121
4 telex F69
5 maritime mobile E.210 and E.211
6 land mobile E.212
7 ISDN/mobile E.214

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